Synonym: ‘Caustic soda’
CAS Number: 1310-73-2
Empirical Formula (Hill Notation): HNaO
Molecular Weight: 40.00
EC Number: 215-185-5
MDL Number: MFCD00003548
Linear Formula: NaOH
Product Type: Chemical
anion traces | chloride (Cl-): ≤20 mg/kg |
phosphate (PO43-): ≤10 mg/kg | |
silicate (as SiO2): ≤100 mg/kg | |
sulfate (SO42-): ≤30 mg/kg | |
assay | 98-100.5% |
cation traces | Al: ≤10 mg/kg |
As: ≤2 mg/kg | |
Ca: ≤10 mg/kg | |
Fe: ≤10 mg/kg | |
Hg: ≤1 mg/kg | |
K: ≤1000 mg/kg | |
Pb: ≤0.5 mg/kg | |
density | 2.13 g/cm3 at 20 °C |
form | pellets |
grade | puriss. |
impurities | ≤0.0005% total nitrogen (N) |
≤0.002% heavy metals (as Pb) | |
≤0.5% Na2CO3 | |
InChI | 1S/Na.H2O/h;1H2/q+1;/p-1 |
InChI key | HEMHJVSKTPXQMS-UHFFFAOYSA |
mp | 318 °C (lit.) |
quality | meets analytical specification of Ph. Eur., BP, NF, E524 |
Quality Level | 200 ![]() |
SMILES string | [OH-].[Na+] |
solubility | water: soluble 1260 g/L at 20 °C |
vapor density | >1 (vs air) |
vapor pressure | <18 mmHg ( 20 °C) |
3 mmHg ( 37 °C) |
Application: | Sodium hydroxide can be used as: • A reagent in the gold-catalyzed selective oxidation of glycerol to glyceric acid. • A catalyst for the cross-dehydrogenative coupling of alcohols and hydrosilanes to synthesize silyl ethers. • A base in the transition-metal free Sonogashira-type couplings of aryl halides and alkynes to synthesize ynones in the presence of PEG as a phase-transfer agent. |
General description: | Sodium hydroxide, also known as lye and caustic soda, is a strong base used universally as a neutralization agent in the chemical industry, paper making, petroleum refining, cleaning compounds, and drain cleaners. |
Symbol | ![]() |
Signal word | Danger |
Hazard statements | H290 - H314 |
Precautionary statements | P234 - P260 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338 |
Hazard Codes | C |
Risk Statements | 35 |
Safety Statements | 26-37/39-45 |
RIDADR | UN 1823 8 / PGII |
WGK Germany | WGK 1 |
Flash Point(F) | Not applicable |
Flash Point(C) | Not applicable |
Purity | 98-100.5% |
mp | 318 °C (lit.) |
Density | 2.13 g/cm3 at 20 °C |
UNSPSC | 12352302 |
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